nfsd: improve client_has_state to check for unused openowners

At least in the v4.0 case openowners can hang around for a while after
last close, but they shouldn't really block (for example), a new mount
with a different principal.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index bac6207..f2ea343 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2256,16 +2256,20 @@ nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
        clid->flags = new->cl_exchange_flags;
 }
 
+static bool client_has_openowners(struct nfs4_client *clp)
+{
+       struct nfs4_openowner *oo;
+
+       list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
+               if (!list_empty(&oo->oo_owner.so_stateids))
+                       return true;
+       }
+       return false;
+}
+
 static bool client_has_state(struct nfs4_client *clp)
 {
-       /*
-        * Note clp->cl_openowners check isn't quite right: there's no
-        * need to count owners without stateid's.
-        *
-        * Also note in 4.0 case should also be checking for openowners
-        * kept around just for close handling.
-        */
-       return !list_empty(&clp->cl_openowners)
+       return client_has_openowners(clp)
 #ifdef CONFIG_NFSD_PNFS
                || !list_empty(&clp->cl_lo_states)
 #endif